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Metacarpo-phalangeal articulations
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These articulations are of the ginglymoid kind, formed by the reception of each of the rounded heads of the metacarpal bones of the four fingers, into a superficial cavity in the extremity of the first phalanges. They are connected by the following ligaments,
- Anterior;
- Two Lateral;
- Synovial Membrane.
The Anterior Ligaments are very thick and dense, they are placed on the palmar surface of the joint in the interval between the lateral ligaments, to which they are connected; they are loosely united to the metacarpal bone, but very firmly to the base of the first phalanges. Their palmar surface is intimately united to the transverse ligament, each ligament forming with it a groove for the passage of the flexor tendons, the sheath surrounding which is connected to it at each side. By their internal surface they form part of the articular surface for the head of the metacarpal bone, and are lined by a synovial membrane.
The Lateral Ligaments are thick and strong rounded cords, placed one on each side of the joint, attached by one extremity to the sides of the head of the metacarpal bones, and by the other, to the contiguous extremity of the phalanges.
The Posterior Ligament is supplied by the extensor tendon of the fingers placed over the back of each joint.
Actions. The movements which occur in these joints are flexion, extension, adduction, abduction, and circumduction; the lateral movements are very limited.
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